Bootstrap 3 创建简单的可折叠菜单 Creating a Simple Navbar with Bootstrap
1. Creating a Simple Navbar with Bootstrap
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Example of Bootstrap 3 Static Navbar</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<style type="text/css">
.bs-example{
margin: 20px;
}
</style>
</head>
<body>
<div class="bs-example">
<nav role="navigation" class="navbar navbar-default">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" data-target="#navbarCollapse" data-toggle="collapse" class="navbar-toggle">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a href="#" class="navbar-brand">Brand</a>
</div>
<!-- Collection of nav links and other content for toggling -->
<div id="navbarCollapse" class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">Profile</a></li>
<li><a href="#">Messages</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Login</a></li>
</ul>
</div>
</nav>
</div>
</body>
</html> — The output of the above example will look something like this:
Note:Use the classes .navbar-left or .navbar-right instead of .pull-left or .pull-right to align the nav links, forms, buttons or text inside the navbar.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Example of Bootstrap 3 Static Navbar Extended</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<style type="text/css">
.bs-example{
margin: 20px;
}
</style>
</head>
<body>
<div class="bs-example">
<nav role="navigation" class="navbar navbar-default">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" data-target="#navbarCollapse" data-toggle="collapse" class="navbar-toggle">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a href="#" class="navbar-brand">Brand</a>
</div>
<!-- Collection of nav links, forms, and other content for toggling -->
<div id="navbarCollapse" class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">Profile</a></li>
<li class="dropdown">
<a data-toggle="dropdown" class="dropdown-toggle" href="#">Messages <b class="caret"></b></a>
<ul role="menu" class="dropdown-menu">
<li><a href="#">Inbox</a></li>
<li><a href="#">Drafts</a></li>
<li><a href="#">Sent Items</a></li>
<li class="divider"></li>
<li><a href="#">Trash</a></li>
</ul>
</li>
</ul>
<form role="search" class="navbar-form navbar-left">
<div class="form-group">
<input type="text" placeholder="Search" class="form-control">
</div>
</form>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Login</a></li>
</ul>
</div>
</nav>
</div>
</body>
</html>— The output of the above example will look something like this:
Tip:To create navbars that is not fixed on the top or bottom, place it anywhere within a .container, which sets the width of your site and content.
2. Bootstrap Fixed Navbar
Creating Navbar Fixed to Top
Tip:Place the fixed .navbar content inside the .container or .container-fluid for proper padding and alignment with the rest of the content.
Creating Navbar Fixed to Bottom
Similarly to create navbars that is fixed at the bottom add the class .navbar-fixed-bottom.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Example of Bootstrap 3 Fixed Navbar</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<style type="text/css">
body{
padding-bottom: 70px;
}
</style>
</head>
<body>
<nav role="navigation" class="navbar navbar-default navbar-fixed-bottom">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" data-target="#navbarCollapse" data-toggle="collapse" class="navbar-toggle">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a href="#" class="navbar-brand">Brand</a>
</div>
<!-- Collection of nav links and other content for toggling -->
<div id="navbarCollapse" class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">Profile</a></li>
<li><a href="#">Messages</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Login</a></li>
</ul>
</div>
</div>
</nav>
<div class="jumbotron">
<div class="container-fluid">
<h1>Fixed Navbar</h1>
<p>The Bootstrap navigation bar is fixed at the bottom of the viewport and does not scroll with the rest of the page.</p>
</div>
</div>
<div class="container-fluid">
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam eu sem tempor, varius quam at, luctus dui. Mauris magna metus, dapibus nec turpis vel, semper malesuada ante. Vestibulum id metus ac nisl bibendum scelerisque non non purus. Suspendisse varius nibh non aliquet sagittis. In tincidunt orci sit amet elementum vestibulum. Vivamus fermentum in arcu in aliquam. Quisque aliquam porta odio in fringilla. Vivamus nisl leo, blandit at bibendum eu, tristique eget risus. Integer aliquet quam ut elit suscipit, id interdum neque porttitor. Integer faucibus ligula.Quis quam ut magna consequat faucibus. Pellentesque eget nisi a mi suscipit tincidunt. Ut tempus dictum risus. Pellentesque viverra sagittis quam at mattis. Suspendisse potenti. Aliquam sit amet gravida nibh, facilisis gravida odio. Phasellus auctor velit at lacus blandit, commodo iaculis justo viverra. Etiam vitae est arcu. Mauris vel congue dolor. Aliquam eget mi mi. Fusce quam tortor, commodo ac dui quis, bibendum viverra erat. Maecenas mattis lectus enim, quis tincidunt dui molestie euismod. Curabitur et diam tristique, accumsan nunc eu, hendrerit tellus. Tibulum consectetur scelerisque lacus, ac fermentum lorem convallis sed.</p>
<p>Orci facilisis, dignissim tortor vitae, ultrices mi. Vestibulum a iaculis lacus. Phasellus vitae convallis ligula, nec volutpat tellus. Vivamus scelerisque mollis nisl, nec vehicula elit egestas a. Sed luctus metus id mi gravida, faucibus convallis neque pretium. Maecenas quis sapien ut leo fringilla tempor vitae sit amet leo. Donec imperdiet tempus placerat. Pellentesque pulvinar ultrices nunc sed ultrices. Morbi vel mi pretium, fermentum lacus et, viverra tellus. Phasellus sodales libero nec dui convallis, sit amet fermentum sapien auctor. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Sed eu elementum nibh, quis varius libero.Nam eget purus nec est consectetur vehicula. Nullam ultrices nisl risus, in viverra libero egestas sit amet. Etiam porttitor dolor non eros pulvinar malesuada. Vestibulum sit amet est mollis nulla tempus aliquet. Praesent luctus hendrerit arcu non laoreet. Morbi consequat placerat magna, ac ornare odio sagittis sed. Donec vitae ullamcorper purus. Vivamus non metus ac justo porta volutpat.</p>
<p>Pulvinar leo id risus pellentesque vestibulum. Sed diam libero, sodales eget sapien vel, porttitor bibendum enim. Donec sed nibh vitae lorem porttitor blandit in nec ante. Pellentesque vitae metus ipsum. Phasellus sed nunc ac sem malesuada condimentum. Etiam in aliquam lectus. Nam vel sapien diam. Donec pharetra id arcu eget blandit. Proin imperdiet mattis augue in porttitor. Quisque tempus enim id lobortis feugiat. Suspendisse tincidunt risus quis dolor fringilla blandit. Ut sed sapien at purus lacinia porttitor. Nullam iaculis, felis a pretium ornare, dolor nisl semper tortor, vel sagittis lacus est consequat eros. Sed id pretium nisl. Curabitur dolor nisl, laoreet vitae aliquam id.Nullam hendrerit justo non leo aliquet imperdiet. Etiam in sagittis lectus. Suspendisse ultrices placerat accumsan. Mauris quis dapibus orci. In dapibus velit blandit pharetra tincidunt. Quisque non sapien nec lacus condimentum facilisis ut iaculis enim. Sed viverra interdum bibendum. Donec ac sollicitudin dolor. Sed fringilla vitae lacus at rutrum. Phasellus congue vestibulum ligula sed consequat.</p>
<p>Enim arcu, interdum vel metus dignissim, venenatis feugiat purus. Nulla posuere orci ut leo sodales, sed cursus dolor ornare. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Etiam sit amet quam orci. Nulla sollicitudin lectus eget posuere venenatis. Sed vestibulum elementum sagittis. Quisque tristique tortor quis feugiat sollicitudin. Ut pellentesque luctus vulputate. Ut at odio ac erat blandit vehicula ut eget urna. In hac habitasse platea dictumst. Nullam ut iaculis nibh, eget eleifend elit.Convallis eget pretium eu, bibendum non leo. Proin suscipit purus adipiscing dolor gravida, in fermentum sapien blandit. Praesent pellentesque ligula dui, in gravida turpis vehicula ac. Pellentesque hendrerit nunc ut luctus hendrerit. Aliquam nec tincidunt urna. Ut interdum nec odio non interdum. Curabitur ligula justo, dapibus non ligula tristique, dapibus tristique nulla. Aliquam pulvinar dapibus eros, rutrum pretium urna iaculis ut. Nam est est, tempus id egestas et, viverra in dui. Aliquam gravida orci tortor, sed congue justo ornare vel. Cras in quam consectetur eros varius scelerisque. Ut vel fermentum purus. Nullam interdum blandit turpis, id pellentesque massa feugiat at. Ut sed lectus lectus. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Nulla rutrum, ante quis convallis ultricies, magna quam rhoncus erat, in lacinia libero magna a ipsum.</p>
<p>Fusce enim arcu, interdum vel metus dignissim, venenatis feugiat purus. Nulla posuere orci ut leo sodales, sed cursus dolor ornare. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Etiam sit amet quam orci. Nulla sollicitudin lectus eget posuere venenatis. Sed vestibulum elementum sagittis. Quisque tristique tortor quis feugiat sollicitudin. Ut pellentesque luctus vulputate. Ut at odio ac erat blandit vehicula ut eget urna. In hac habitasse platea dictumst. Nullam ut iaculis nibh, eget eleifend elit.</p>
</div>
</body>
</html>Note:Remember to add <a href="http://www.tutorialrepublic.com/css-reference/css-padding-property.php">padding</a> (at least 70px) to the top or bottom of the <a href="http://www.tutorialrepublic.com/html-reference/html-body-tag.php"><body></a> element to avoid the content to go underneath the navbar while implementing fixed top or bottom navbar. Also be sure to add your custom style sheet after the core Bootstrap CSS file, otherwise it may not work.
Bootstrap Static Top Navbar
You can also create full-width navbar that appears on the top but scrolls away with the page by adding the class .navbar-static-top. Unlike the .navbar-fixed-top class, you do not need to change any padding on the <a href="http://www.tutorialrepublic.com/html-reference/html-body-tag.php"><body></a> element.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Example of Bootstrap 3 Static Top Navbar</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>
<nav role="navigation" class="navbar navbar-default navbar-static-top">
<div class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" data-target="#navbarCollapse" data-toggle="collapse" class="navbar-toggle">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a href="#" class="navbar-brand">Brand</a>
</div>
<!-- Collection of nav links and other content for toggling -->
<div id="navbarCollapse" class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">Profile</a></li>
<li><a href="#">Messages</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Login</a></li>
</ul>
</div>
</div>
</nav>
<div class="jumbotron">
<div class="container">
<h1>Static Top Navbar</h1>
<p>The Bootstrap navigation bar appears on the top of the viewport like fixed navbar but it is static and scrolls with the rest of the page.</p>
</div>
</div>
<div class="container">
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam eu sem tempor, varius quam at, luctus dui. Mauris magna metus, dapibus nec turpis vel, semper malesuada ante. Vestibulum id metus ac nisl bibendum scelerisque non non purus. Suspendisse varius nibh non aliquet sagittis. In tincidunt orci sit amet elementum vestibulum. Vivamus fermentum in arcu in aliquam. Quisque aliquam porta odio in fringilla. Vivamus nisl leo, blandit at bibendum eu, tristique eget risus. Integer aliquet quam ut elit suscipit, id interdum neque porttitor. Integer faucibus ligula.Quis quam ut magna consequat faucibus. Pellentesque eget nisi a mi suscipit tincidunt. Ut tempus dictum risus. Pellentesque viverra sagittis quam at mattis. Suspendisse potenti. Aliquam sit amet gravida nibh, facilisis gravida odio. Phasellus auctor velit at lacus blandit, commodo iaculis justo viverra. Etiam vitae est arcu. Mauris vel congue dolor. Aliquam eget mi mi. Fusce quam tortor, commodo ac dui quis, bibendum viverra erat. Maecenas mattis lectus enim, quis tincidunt dui molestie euismod. Curabitur et diam tristique, accumsan nunc eu, hendrerit tellus. Tibulum consectetur scelerisque lacus, ac fermentum lorem convallis sed.</p>
<p>Orci facilisis, dignissim tortor vitae, ultrices mi. Vestibulum a iaculis lacus. Phasellus vitae convallis ligula, nec volutpat tellus. Vivamus scelerisque mollis nisl, nec vehicula elit egestas a. Sed luctus metus id mi gravida, faucibus convallis neque pretium. Maecenas quis sapien ut leo fringilla tempor vitae sit amet leo. Donec imperdiet tempus placerat. Pellentesque pulvinar ultrices nunc sed ultrices. Morbi vel mi pretium, fermentum lacus et, viverra tellus. Phasellus sodales libero nec dui convallis, sit amet fermentum sapien auctor. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Sed eu elementum nibh, quis varius libero.Nam eget purus nec est consectetur vehicula. Nullam ultrices nisl risus, in viverra libero egestas sit amet. Etiam porttitor dolor non eros pulvinar malesuada. Vestibulum sit amet est mollis nulla tempus aliquet. Praesent luctus hendrerit arcu non laoreet. Morbi consequat placerat magna, ac ornare odio sagittis sed. Donec vitae ullamcorper purus. Vivamus non metus ac justo porta volutpat.</p>
<p>Pulvinar leo id risus pellentesque vestibulum. Sed diam libero, sodales eget sapien vel, porttitor bibendum enim. Donec sed nibh vitae lorem porttitor blandit in nec ante. Pellentesque vitae metus ipsum. Phasellus sed nunc ac sem malesuada condimentum. Etiam in aliquam lectus. Nam vel sapien diam. Donec pharetra id arcu eget blandit. Proin imperdiet mattis augue in porttitor. Quisque tempus enim id lobortis feugiat. Suspendisse tincidunt risus quis dolor fringilla blandit. Ut sed sapien at purus lacinia porttitor. Nullam iaculis, felis a pretium ornare, dolor nisl semper tortor, vel sagittis lacus est consequat eros. Sed id pretium nisl. Curabitur dolor nisl, laoreet vitae aliquam id.Nullam hendrerit justo non leo aliquet imperdiet. Etiam in sagittis lectus. Suspendisse ultrices placerat accumsan. Mauris quis dapibus orci. In dapibus velit blandit pharetra tincidunt. Quisque non sapien nec lacus condimentum facilisis ut iaculis enim. Sed viverra interdum bibendum. Donec ac sollicitudin dolor. Sed fringilla vitae lacus at rutrum. Phasellus congue vestibulum ligula sed consequat.</p>
<p>Enim arcu, interdum vel metus dignissim, venenatis feugiat purus. Nulla posuere orci ut leo sodales, sed cursus dolor ornare. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Etiam sit amet quam orci. Nulla sollicitudin lectus eget posuere venenatis. Sed vestibulum elementum sagittis. Quisque tristique tortor quis feugiat sollicitudin. Ut pellentesque luctus vulputate. Ut at odio ac erat blandit vehicula ut eget urna. In hac habitasse platea dictumst. Nullam ut iaculis nibh, eget eleifend elit.Convallis eget pretium eu, bibendum non leo. Proin suscipit purus adipiscing dolor gravida, in fermentum sapien blandit. Praesent pellentesque ligula dui, in gravida turpis vehicula ac. Pellentesque hendrerit nunc ut luctus hendrerit. Aliquam nec tincidunt urna. Ut interdum nec odio non interdum. Curabitur ligula justo, dapibus non ligula tristique, dapibus tristique nulla. Aliquam pulvinar dapibus eros, rutrum pretium urna iaculis ut. Nam est est, tempus id egestas et, viverra in dui. Aliquam gravida orci tortor, sed congue justo ornare vel. Cras in quam consectetur eros varius scelerisque. Ut vel fermentum purus. Nullam interdum blandit turpis, id pellentesque massa feugiat at. Ut sed lectus lectus. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Nulla rutrum, ante quis convallis ultricies, magna quam rhoncus erat, in lacinia libero magna a ipsum.</p>
<p>Fusce enim arcu, interdum vel metus dignissim, venenatis feugiat purus. Nulla posuere orci ut leo sodales, sed cursus dolor ornare. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Etiam sit amet quam orci. Nulla sollicitudin lectus eget posuere venenatis. Sed vestibulum elementum sagittis. Quisque tristique tortor quis feugiat sollicitudin. Ut pellentesque luctus vulputate. Ut at odio ac erat blandit vehicula ut eget urna. In hac habitasse platea dictumst. Nullam ut iaculis nibh, eget eleifend elit.</p>
</div>
</body>
</html>Bootstrap Navbar with Search From
Search form is very common component of the navbars and you have seen it on various website quite often. Search form can be placed inside the navbar using the class .navbar-form on the <a href="http://www.tutorialrepublic.com/html-reference/html-form-tag.php"><form></a> element.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Example of Bootstrap 3 Navbar with Search From</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<style type="text/css">
.bs-example{
margin: 20px;
}
</style>
</head>
<body>
<div class="bs-example">
<nav role="navigation" class="navbar navbar-default">
<div class="navbar-header">
<button type="button" data-target="#navbarCollapse" data-toggle="collapse" class="navbar-toggle">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a href="#" class="navbar-brand">Brand</a>
</div>
<div id="navbarCollapse" class="collapse navbar-collapse">
<form role="search" class="navbar-form navbar-left">
<div class="form-group">
<input type="text" placeholder="Search" class="form-control">
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
</div>
</nav>
</div>
</body>
</html>Creating the Inverted Variation of a Navbar
You can also create inverted variation of the Bootstrap navbar by adding an extra class .navbar-inverse to the .navbar base class, without any further change in markup.
<!DOCTYPE html>
<html lang="en">
<head>
<title>Example of Bootstrap 3 Responsive Navbar</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<style type="text/css">
.navbar{
margin-top: 20px;
}
</style>
</head>
<body>
<div class="container">
<nav role="navigation" class="navbar navbar-inverse">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" data-target="#navbarCollapse" data-toggle="collapse" class="navbar-toggle">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a href="#" class="navbar-brand">Brand</a>
</div>
<!-- Collection of nav links, forms, and other content for toggling -->
<div id="navbarCollapse" class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">Profile</a></li>
<li class="dropdown">
<a data-toggle="dropdown" class="dropdown-toggle" href="#">Messages <b class="caret"></b></a>
<ul role="menu" class="dropdown-menu">
<li><a href="#">Inbox</a></li>
<li><a href="#">Drafts</a></li>
<li><a href="#">Sent Items</a></li>
<li class="divider"></li>
<li><a href="#">Trash</a></li>
</ul>
</li>
</ul>
<form role="search" class="navbar-form navbar-left">
<div class="form-group">
<input type="text" placeholder="Search" class="form-control">
</div>
</form>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Login</a></li>
</ul>
</div>
</nav>
</div>
</body>
</html>— The output of the above example will look something like this:
原文：http://www.tutorialrepublic.com/twitter-bootstrap-tutorial/bootstrap-navbar.php
本文：Bootstrap 3 创建简单的可折叠菜单 Creating a Simple Navbar with Bootstrap
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